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        <p><code>drawer</code>是<code>Scaffold</code>一个子属性</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">drawer: Container(</span><br><span class="line">  color: Colors.white,</span><br><span class="line">  padding: EdgeInsets.all(8),</span><br><span class="line">  child: Column(</span><br><span class="line">    mainAxisAlignment: MainAxisAlignment.center,</span><br><span class="line">    children: &lt;Widget&gt;[</span><br><span class="line">      Text(&#39;This is drawer&#39;)</span><br><span class="line">    ],</span><br><span class="line">  ),</span><br><span class="line">),</span><br></pre></td></tr></table></figure>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-2dcb49738643179b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="drawer"></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">drawer: Drawer(</span><br><span class="line">  child: ListView(</span><br><span class="line">    padding: EdgeInsets.zero,</span><br><span class="line">    children: &lt;Widget&gt;[</span><br><span class="line">      DrawerHeader(</span><br><span class="line">        child: Text(&#39;header&#39;.toUpperCase()),</span><br><span class="line">        decoration: BoxDecoration(</span><br><span class="line">          color: Colors.grey[100]</span><br><span class="line">        ),</span><br><span class="line">      ),</span><br><span class="line">      ListTile(</span><br><span class="line">        title: Text(&#39;Messages&#39;, textAlign: TextAlign.right,),</span><br><span class="line">        trailing: Icon(Icons.message, color: Colors.black12, size: 22,),</span><br><span class="line">      ),</span><br><span class="line">      ListTile(</span><br><span class="line">        title: Text(&#39;Favorite&#39;, textAlign: TextAlign.right,),</span><br><span class="line">        trailing: Icon(Icons.favorite, color: Colors.black12, size: 22,),</span><br><span class="line">      ),</span><br><span class="line">      ListTile(</span><br><span class="line">        title: Text(&#39;Setting&#39;, textAlign: TextAlign.right,),</span><br><span class="line">        trailing: Icon(Icons.settings, color: Colors.black12, size: 22,),</span><br><span class="line">      ),</span><br><span class="line">    ],</span><br><span class="line">  ),</span><br><span class="line">)</span><br></pre></td></tr></table></figure>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-d6edfb37f894d987.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="image.png"></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br></pre></td><td class="code"><pre><span class="line">class DrawerDemo extends StatelessWidget &#123;</span><br><span class="line">  @override</span><br><span class="line">  Widget build(BuildContext context) &#123;</span><br><span class="line">    return DefaultTabController(</span><br><span class="line">      length: 3,</span><br><span class="line">      child: Scaffold(</span><br><span class="line">        appBar: AppBar(</span><br><span class="line">          &#x2F;&#x2F; 如果未指定leading，Drawer属性将会自动添加Icons.menu这个图标</span><br><span class="line">          centerTitle: true,</span><br><span class="line">          title: Text(&#39;NINGHAO&#39;),</span><br><span class="line">          actions: &lt;Widget&gt;[</span><br><span class="line">            IconButton(</span><br><span class="line">              icon: Icon(Icons.search),</span><br><span class="line">              tooltip: &#39;Search&#39;,</span><br><span class="line">              onPressed: ()&#x3D;&gt;&#123;</span><br><span class="line">                debugPrint(&#39;Search button is pressed&#39;),</span><br><span class="line">              &#125;,</span><br><span class="line">            ),</span><br><span class="line">            IconButton(</span><br><span class="line">              icon: Icon(Icons.more_horiz),</span><br><span class="line">              tooltip: &#39;Navigration_horizal&#39;,</span><br><span class="line">              onPressed: ()&#x3D;&gt;&#123;</span><br><span class="line">                debugPrint(&#39;more_horiz button is pressed&#39;),</span><br><span class="line">              &#125;,</span><br><span class="line">            ),</span><br><span class="line">          ],</span><br><span class="line">          bottom: TabBar(</span><br><span class="line">            unselectedLabelColor: Colors.black38, &#x2F;&#x2F; 标签栏中未选择的图标颜色</span><br><span class="line">            indicatorColor: Colors.black54, &#x2F;&#x2F; 标签栏中选中的线（指示器）的颜色</span><br><span class="line">            indicatorSize: TabBarIndicatorSize.label, &#x2F;&#x2F; 线的长度</span><br><span class="line">            indicatorWeight: 1.0, &#x2F;&#x2F; 线的宽度</span><br><span class="line">            tabs: &lt;Widget&gt;[</span><br><span class="line">              Tab(icon: Icon(Icons.local_florist),),</span><br><span class="line">              Tab(icon: Icon(Icons.change_history),),</span><br><span class="line">              Tab(icon: Icon(Icons.directions_bike),),</span><br><span class="line">            ],</span><br><span class="line">          ),</span><br><span class="line">        ),</span><br><span class="line">        body: TabBarView(</span><br><span class="line">          children: &lt;Widget&gt;[</span><br><span class="line">            Icon(Icons.local_florist, size: 128, color: Colors.black12,),</span><br><span class="line">            Icon(Icons.change_history, size: 128, color: Colors.black12,),</span><br><span class="line">            Icon(Icons.directions_bike, size: 128, color: Colors.black12,)</span><br><span class="line">          ],</span><br><span class="line">        ),</span><br><span class="line">        drawer: Drawer(</span><br><span class="line">          child: ListView(</span><br><span class="line">            padding: EdgeInsets.zero,</span><br><span class="line">            children: &lt;Widget&gt;[</span><br><span class="line">              DrawerHeader(</span><br><span class="line">                child: Text(&#39;header&#39;.toUpperCase()),</span><br><span class="line">                decoration: BoxDecoration(</span><br><span class="line">                  color: Colors.grey[100]</span><br><span class="line">                ),</span><br><span class="line">              ),</span><br><span class="line">              ListTile(</span><br><span class="line">                title: Text(&#39;Messages&#39;, textAlign: TextAlign.right,),</span><br><span class="line">                trailing: Icon(Icons.message, color: Colors.black12, size: 22,),</span><br><span class="line">              ),</span><br><span class="line">              ListTile(</span><br><span class="line">                title: Text(&#39;Favorite&#39;, textAlign: TextAlign.right,),</span><br><span class="line">                trailing: Icon(Icons.favorite, color: Colors.black12, size: 22,),</span><br><span class="line">              ),</span><br><span class="line">              ListTile(</span><br><span class="line">                title: Text(&#39;Setting&#39;, textAlign: TextAlign.right,),</span><br><span class="line">                trailing: Icon(Icons.settings, color: Colors.black12, size: 22,),</span><br><span class="line">              ),</span><br><span class="line">              ListTile(</span><br><span class="line">                title: Text(&#39;exit&#39;, textAlign: TextAlign.right,),</span><br><span class="line">                trailing: Icon(Icons.exit_to_app, color: Colors.black12, size: 22,),</span><br><span class="line">                &#x2F;&#x2F; 点击该列表项关闭抽屉</span><br><span class="line">                onTap: ()&#x3D;&gt; Navigator.pop(context),</span><br><span class="line">              )</span><br><span class="line">            ],</span><br><span class="line">          ),</span><br><span class="line">        )</span><br><span class="line">      ),</span><br><span class="line">    );</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-1c409af0433c6b72.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="界面样式"><br><img src="https://upload-images.jianshu.io/upload_images/16731485-59393df8ad1ba492.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="抽屉打开"></p>
<h2 id="UserAccountsDrawerHeader"><a href="#UserAccountsDrawerHeader" class="headerlink" title="UserAccountsDrawerHeader"></a>UserAccountsDrawerHeader</h2><p>如果要显示抽屉里的用户账号信息，我们可以将<code>DrawerHeader</code>替换为<code>UserAccountsDrawerHeader</code>，代码如下所示：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">UserAccountsDrawerHeader(</span><br><span class="line">  accountName: Text(&#39;wanghao&#39;, style: TextStyle(fontWeight: FontWeight.bold),),</span><br><span class="line">  accountEmail: Text(&#39;wanghao@ninghao.net&#39;),</span><br><span class="line">  currentAccountPicture: CircleAvatar(</span><br><span class="line">    backgroundImage: AssetImage(&#39;resources&#x2F;images&#x2F;profilePhoto.jpg&#39;),</span><br><span class="line">  ),</span><br><span class="line">),</span><br></pre></td></tr></table></figure>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-55d65f2c1f6075c5.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="设置用户账号信息"></p>
<h2 id="设置UserAccountsDrawerHeader的背景样式"><a href="#设置UserAccountsDrawerHeader的背景样式" class="headerlink" title="设置UserAccountsDrawerHeader的背景样式"></a>设置UserAccountsDrawerHeader的背景样式</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">UserAccountsDrawerHeader(</span><br><span class="line">  accountName: Text(&#39;wanghao&#39;, style: TextStyle(fontWeight: FontWeight.bold),),</span><br><span class="line">  accountEmail: Text(&#39;wanghao@ninghao.net&#39;),</span><br><span class="line">  currentAccountPicture: CircleAvatar(</span><br><span class="line">    backgroundImage: AssetImage(&#39;resources&#x2F;images&#x2F;profilePhoto.jpg&#39;),</span><br><span class="line">  ),</span><br><span class="line">  decoration: BoxDecoration(</span><br><span class="line">    color: Colors.yellow[400], &#x2F;&#x2F; 如果没有背景图像没有填满的话，背景颜色才会显露</span><br><span class="line">    image: DecorationImage(</span><br><span class="line">      image: NetworkImage(&#39;https:&#x2F;&#x2F;resources.ninghao.org&#x2F;images&#x2F;candy-shop.jpg&#39;),</span><br><span class="line">      fit: BoxFit.cover, &#x2F;&#x2F; </span><br><span class="line">      colorFilter: ColorFilter.mode( &#x2F;&#x2F; 混合模式，相当于遮罩层</span><br><span class="line">        Colors.blue[400].withOpacity(0.6), &#x2F;&#x2F; 将遮罩层的透明度设为0.6</span><br><span class="line">        BlendMode.hardLight</span><br><span class="line">      )</span><br><span class="line">    )</span><br><span class="line">  ),</span><br><span class="line">),</span><br></pre></td></tr></table></figure>
<p><img src="https://upload-images.jianshu.io/upload_images/16731485-2f03f95a783a52f3.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="设置用户信息的背景样式"></p>

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